Mechanism for cutting sheets from webs



H. M. BARBER MECHANISM FOR CUTTING SHEETS FROM WEBS 2 Sheets-Sheet 1 Filed May 26, 1923 r I N VENTOR m% ATTORNE YS H. M. BARBER MECHANISM FOR CUTTING SHEETS FROM WEBS- Filed May 26, 1923 2 Sheets-Sheet 2 INVENTOR 7 awn/z 711%,

ATTORNE YS Patented Nov. 29, 1927.

U tilhltt STATES team rarest orr i'ce.

HOWARD M. BARBER, F STONINGTON, CONNECTICUT, ASSIGNOB- TO C. B. COTTRELL 65 SONS COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

Ill/IECHANISIYI FOB, CUTTING SHEETS FROM VTEBS.

Application filed. May 26,

It is necessary in order to make a square cut with a cutting mechanism having coacting rotary and stationary cutting members, toarrest the travel of the web during the cutting operation.

The object of my invention is to ensure a square cut across the web, by providing novel means for arresting the travel of the web during the cutting operation, such means in the presentinstance acting on the web by suction to hold it on its guide plate during the cutting operation, which suction means may be controlled by the cutting mechanism and is able to handle material of any thickness without special adjustment.

A practical embodiment of my invention is represented in the accompanying drawings, in which Fig. 1 represents in side elevation a portion of a web feeding and cutting mechanism, with my invention applied thereto,

2 represents a detail front view of the web guide plate and its adjacent parts.

Fig. 3 represents a cross section taken in the plane of the line TIT-ITT of Fig. 2.

Fig. at represents a cross section taken in the plane of the line TVIV of Fig. 2.

5 represents an enlarged detail longitudinal. section taken in the plane of the line V-V of Fig. 2.

Fig. 6 represents an enlarged detail in cross section, in the plane of the line VIVT of 2.

The web feed drum 1 is mounted on the shaft 2, which shaft is positively driven from the drive shaft 3 through the geared connection 4, 5. A pair of pressure feed rollers are denoted by 6, 7, the swinging supports therefor being denoted by 8, 9. These pressure feed rollers are suitablydriven and brought into coaction with the web feed druni l to feed the web continuously onto the web guide plate 10, which is located between the web feed drum 1 and the cutting mechanism.

This cutting mechanism comprises the rotary cutting member 11 with its knife 12 and the stationary cutting member 13 with its knife 14. The rotary cutting member 11 is suitably mounted on the shaft 15 which is driven from the drive shaft 3 through the train of gears 16, 17, 18, 19, 20.

The suction means which I have shown for momentarily arresting the travel of the 1923. Serial N0. 641,770.

web on the web guide plate 10 during the cutting operation is constructed, arranged and operated as follows The web guide plate is provided transversely across its back with a suction chamber 21 and transversely across its face with a series of perforations 22" communicating with said suction chamber. A vacuum tank 23 has its chamber communicating through suitable piping 24 with an air exhaust pump 25 which is driven, in the present instance, through a train of gears 26, 27, 28, 29, 30, from the cylinder 31. This vacuum chamher is brought into communication through suitable piping 32 with a valve chest 33 carried by the web guide plate 10, which valve chest has ports 34. 35 in alinement with corresponding ports 36, 37, communicating with the suction chamber 21. The piston 38 of a suction controlled valve slides in the chest 33 and is arranged to openthe ports 34, 36 to bring the suction chamber into'communica" tion with the vacuum chamber for exerting suction on the web through the perforations 22, to arrest the web during the cutting operation. This piston 38 is also movable to close the ports 34, 36 and open the ports 35, 37 to external atmosphere, for releasing the suction effect on the web the moment the cutting operation is completed. This piston 38 is operated from a cam 39 on the shaft 15 of the rotary cutting member through the rock lever 40 and connecting rod 41, a spring 42 serving to hold the lever stud 43 against the surface of the cam 39. v

Manually operatingmeans are prvided for cutting off more or less of the perforations 22 in the face of the web guide plate, to suit webs of different widths, which means is herein shown as comprising two plugs 44, slidably fitting the bore of the suction chamber 21 and having flexible shanks L5 provided exterior to the ends of the chamber with suitable handles 46. These plugs 44 may be secured in any desired position within the suction chamber 21 as, for instance, by providing the flexible shanks 45 with circumferential grooves 47 arranged to be engaged by the locking plates 48 at the ends of said suction chamber.

From the above description it will be seen that I have provided means whereby instantaneous action on the web may be obtained for arresting the travel of the web during the cutting operation, said means being so arranged as not to impede the travel of the web between the cutting operations.

It is evident that various changes may be resorted to in the construction, form and arrangement ot the several parts without departing from the spirit and scope ot my invent-ion; hence, I do not wish to be limited to the particular embodiment herein shown and described, but

\Vhat I claim is 1. htechanism for cutting sheets from a web, means for continuously feeding the web and suction means acting on the web to:- momentarily arresting its travel during the cutting operation.

2. hlechanism for cutting sheets from a web, means for continuously ."leeding the web, and suction means controlled by the cutting mechanism, acting on the web for mon'lentarily arresting its travel during the cutting operation.

3. Mechanism for cutting sheets from a web, means for continuously feeding the web, a web guide plate having a suction hamber and a series of perforations across the face of the plate communicating with said chamber, and means for rendering the suction chamber efl'ective through said perforations, to momentarily arrest the travel of the web during the cutting operation.

4. Mechanism for cutting sheets from a web, means for continuously feeding the web, a web guide plate having a suction chamber and a series of perforations across the face of the plate communicating with said chamher, and means operated by the cutting mechanism for rendering the suction chamber effective through said perforations, to momentarily arrest the travel of the web during the cutting operation.

5. Mechanism for cutting sheets from a web, means for continuously feeding the web, a web guide plate having a suction chamber and a series of perforations across the taco ot the plate communicating with said chamber, a vacuum chamber, manually operated means for cutting oll' more or less 01'' the perforations to suit webs of different widths, and means for opening communica tion between the suction and vacuum chambers, to arrest the travel of the web during the cutting operation.

(3. Mechanism for cutting sheets from a web, means for continuously feeding the web, a web guide plate having a suction chamher and a series of ptli tfl'tltlfll'lfi across the il acc ot the plate communicating with said chamber. a vacuum chamber, and means operated by the cutting mechanism for o aining conm:unication between the suction and vacuum chambers, to momentarily arrest the travel of the web during the cutting operation.

7. Mechanism for cutting sheets from a web, means for continuously feeding the web, a web guide plate having a suction chamber and a series of perforations across the face oi the plate communicating with said chamber, a vacuum chamber, manually operated means for cutting ott more or less of the perforations to suit webs of difl'erent widths, and means operated by the cutting mechanism for opening communication between the suction and vacuum chambers. to arrest the travel of the web during the cutting operation.

In testimony, that I claim the foregoing as my invention, I have signed my name this Q ith day of May 1923.

I-IOlVARD M. BARBER. 

